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Hi @abbasi1986
If you want to get SP without buying than you need to convert your steem dollor to steem power for that you have an option in the setting, buy default its is set to 50%, which means if you earn $1 on your post you will get 50% will be converted to steem power, you can change it to 100%.
Bottom line is you have to get upvote on your post from someone who has high vote value( high steem power)

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